Invoice Ninja
Leading#4 in Open sourcehigh confidence
Widely used self-hosted invoicing, billing and expense platform (~9.9k★) for freelancers and small businesses.Our read
Why it ranks #4
A mature invoicing specialist with 9,906 GitHub stars, broad self-hosting recognition and a long-running community around its hosted and open-source editions.Here is the catch
not a full double-entry general ledger
self-hosted upgrades, mail and payment configuration require maintenance
community feedback notes occasional UI and mobile workflow friction
Does this well
polished invoicing workflow with many payment gateways
hosted and self-hosted deployment choices
strong automation for freelancers and service businesses
Pricing
Checked by hand on 2026-07-23. Prices in this category change often — if this looks wrong, it probably is.
Key features
Invoices, quotes and recurring billingOnline payments and client portalTime tracking, tasks and projectsExpenses, vendors and purchase orders
Sources we read
Quick facts
More in this area
The rest of the Open source column.- 1ERPNextMost-adopted open-source accounting/ERP (~37k★) — a full double-entry accounting module (GL, invoicing, tax, reports) positioned as the OSS QuickBooks/SAP alternative for SMBs.
- 2Firefly IIIThe recognized self-hosted double-entry finance manager (~24k★); the go-to open-source app for tracking accounts, budgets and transactions.
- 3AkauntingPopular self-hosted web accounting for small businesses and freelancers (~10k★): invoicing, expense tracking, banking and tax management.
- 5LedgerThe original plain-text, command-line double-entry accounting tool (~6k★); the foundation of the plaintext-accounting movement.
- 6BeancountPlain-text double-entry accounting language and toolset (~5.8k★, with the Fava web UI); favored by developers who script and automate their books.
- 7hledgerRobust, actively maintained plain-text accounting tool (~4.6k★) — a Ledger-compatible reimplementation with strong CLI, web and reporting.